National Bank Open: Jacob Fearnley vs Adrian Mannarino

Platform comparison

Market context

Jacob Fearnley’s first-round match with Adrian Mannarino at the National Bank Open in Montréal is the event behind this market, but the trading venue matters because different platforms express the same view in different formats. Tennis.com has Fearnley as a 61% projected winner, while Tennis Temple shows the contest at 50-50, and French and odds-led previews put Fearnley around 1.56–1.58 decimal odds against Mannarino at roughly 2.42–2.48, implying a modest favourite rather than a near-certainty.[1][3][12][15] That is a useful comparison for prediction markets: Polymarket-style contracts price a direct yes/no probability, whereas Betfair and Smarkets-style books show decimal odds and usually charge commission rather than embedding the full margin in the quoted price.

Historically, this sort of market is easiest to read as a thin-favourite spot, not a locked outcome. The head-to-head record since 2022 is 0-0, so there is no direct recent matchup edge to anchor the price, and the ATP Masters 1000 setting in Montréal means both draw position and physical condition can matter more than name value alone.[4] The current 100% YES crowd price is therefore much more extreme than the broader market picture, especially when the underlying pre-match estimates sit closer to a low-60s Fearnley win chance than to certainty.[1][12]

The key catalysts are simple: whether the match is actually played, whether the start order holds, and whether any late withdrawal or weather disruption pushes it outside the settlement window. The match was listed as a first-round fixture at the National Bank Open, but several live listings show it as upcoming on 4 August rather than completed, so any schedule slip is material for a market that flips to 50-50 if the contest is not finished in time.[5][7] Platform access also differs: Polymarket and Kalshi have US-facing KYC and state restrictions, while Betfair and Smarkets operate through traditional sportsbook-style or exchange-style accounts with their own regional availability and fee structures, so the same event can look materially different once commissions, exchange liquidity, and user eligibility are factored in.[13]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read National Bank Open: Jacob Fearnley vs Adrian Mannarino from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

FAQ

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Robinhood Prediction Markets offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.